In H16.0.573 I created a terrain using Heightfields without caching the end result, as everything computed fairly quick. Unfortunately, that scene didn't seem to work on the farm due to an OpenCL issue, clCreateProgramWithSource() failed.
The machines on the farm do not have graphics cards, so OpenCL won't work in this environment. Therefore I debugged my scene and it seems like some Heightfield SOPs are using OpenCL. I was too lazy to inspect the individual nodes, but it was great if it was easier to see if a certain node will try using OpenCL, as this won't work on many farms.